US4348599A - Process and device for delivering a monochromatic light beam by stimulated scattering - Google Patents

Process and device for delivering a monochromatic light beam by stimulated scattering Download PDF

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Publication number
US4348599A
US4348599A US06/264,095 US26409581A US4348599A US 4348599 A US4348599 A US 4348599A US 26409581 A US26409581 A US 26409581A US 4348599 A US4348599 A US 4348599A
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frequency
medium
spectrum
linewidth
light beam
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Francois Pradere
Robert Frey
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Centre National de la Recherche Scientifique CNRS
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Centre National de la Recherche Scientifique CNRS
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Assigned to CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE reassignment CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FREY ROBERT, PRADERE FRANCOIS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves

Definitions

  • the invention relates to a process and a device for delivering a monochromatic output light beam having a narrow spectrum linewidth; it is particularly--but not exclusively--suitable for use in photochemistry.
  • a process for generation of a light beam with a narrow spectrum linewidth comprising, superimposing an amplifying medium exhibiting a large stimulated light emission spectrum linewidth at a first frequency and a pump light beam at a second frequency, higher than said first frequency, the first frequency being contained in the stimulated emission spectrum linewidth of the medium induced by the second frequency.
  • the intensity of the light radiation beam at the first frequency may be considerably increased without substantial degradation of the spectrum linewidth, whereby there is an increase of the monochromatic intensity
  • That process is quite different from those which use stimulated light scattering for frequency shift.
  • the latter processes use amplification of the inherent noise (typically Raman noise) of the system so that the spectral characteristics of the radiation obtained depend on the spectrum linewidth ⁇ T of the transition in the medium and on the spectrum linewidth of the pump wave ⁇ p .
  • a very monochromatic signal is injected, whose width ⁇ S may be very much less than ⁇ P and whose frequency is within the spectrum region where the pump wave induces a gain.
  • an amplifying medium presenting Raman scattering is used.
  • the second beam forms in this case the pump beam.
  • the first one having a much smaller spectrum linewidth than that of the transition is at a frequency equal to or close to that of the Stokes spectrum line which would be induced by the pump beam if the gain were sufficient.
  • the two beams may be provided by pulsed lasers.
  • Raman effect stimulated light scattering other properties may be used and particularly Rayleigh scattering (with frequency change) or Brillouin scattering.
  • Raman effect entails refraining to reach the threshold of the Brillouin effect, since there would otherwise appear competition between the two effects.
  • lasers are radiation sources particularly suitable for implementing the invention
  • other sources of coherent monochromatic radiation in the useful spectrum may be used, e.g. parametric oscillator systems.
  • a device for generation of a monochromatic light output beam having a narrow spectrum line comprising: an enclosure for receiving a medium having a wide induced amplification spectrum line; a first pulsed light source for energy extraction selected to inject a light beam with a narrow spectrum linewidth at a first frequency into said medium; a second pulsed source for pumping action which provides in operation a light beam at a second frequency, different from the first, said first frequency being selected to be within the amplification spectrum line of the medium when subjected to the action of the pump beam; and optical means for rendering the two beams colinear in the enclosure.
  • FIGURE is a simplified diagram of that embodiment.
  • an amplifying medium 10 capable of exhibiting stimulated Raman scattering, for example a hydrogen and argon mixture under an adjustable pressure.
  • the mixture is contained in an enclosure 11 whose length is sufficient to avoid oscillations due to multiple reflections during the time duration of one light pulse. A length of about one meter is satisfactory for pulses of 2.5 ns.
  • the spectrum linewidth ⁇ T of the mixture for the Q1 transition of hydrogen may be varied.
  • Laser 12 may be a multi-stage dye laser, having an oscillator stage and at least one amplifier stage.
  • the spectrum linewidth of the pump beam ⁇ P must be less than ⁇ T .
  • the frequency of the pump beam may vary within wide limits.
  • Laser 12 will in general comprise an element for adjusting the spectrum linewidth, such as a Fabry-Perrot etalon 13.
  • the energy extraction beam may be provided by a dye laser 14 similar to laser 12 and triggered in synchronism therewith.
  • Lasers 12 and 14 may be energized by the same pumping source, for example a ruby laser.
  • Optical means are arranged for rendering the output beams of lasers 12 and 14 colinear in tank 11.
  • the optical means are schematized as a first mirror 16 for reflecting the energy extraction beam and a mirror 17 transparent for the pump wave length and reflecting the energy extraction wave length (dielectric layer mirror in general).
  • Laser 14 and especially laser 12 which has a wider spectrum linewidth, may have high peak powers: tests have been carried out with a power of 200 MW/cm 2 for the pump beam and a few MW/cm 2 for the energy extraction beam.
  • Table I gives, by way of example, results which were obtained from representative tests of the different modes of use which may be contemplated:
  • ⁇ T , ⁇ P and ⁇ S have the above-mentioned meanings;
  • A designates the amount of amplification obtained, i.e. the ratio between the value which the wave at the frequency of the Stokes spectrum line exhibits at the output of enclosure 11 and the value of the energy extraction beam.
  • R designates the quantum conversion efficiency.
  • T designates the spectral compression rate defined as:
  • the value of the spectral compression rate reflects the degree of energy transfer from the pump beam, which has a relatively wide spectrum, to the spectrally narrow "signal" beam.
  • the amplification may be varied in a large range. It is limited only by the depopulation of the pump wave. It depends both on the intensity of the pump wave and on that of the energy extraction wave. The amount of amplification and the degree of efficiency vary in opposite directions.
  • Test No. 2 shows that the wavelength of the energy extraction need not necessarily correspond exactly to the Stokes spectrum line, for the Raman transition spectrum line is relatively wide.
  • quantum efficiency was only decreased in a relatively low ratio.
  • This tuning possibility presents great interest when the pump beam is supplied by a laser which only can deliver discrete frequencies, such as a CO 2 laser. Then the Stokes frequency may be tuned within the Raman spectrum line by adjusting the tuning means of the energy extraction laser 14.
  • the objects may be conciliated by using a multi-stage system in which the first stage at least provides a high value of A and the last stage at least is selected to exhibit a high value of R.
  • the repetition rate of the pulses which may be obtained is limited by that of the pump laser and by the heating up of the Raman medium. Apparatuses may be constructed which supply a radiation with high mean power and great spectral purity, with satisfactory efficiency.
  • the source of the energy extraction beam may be of any type capable of supplying coherent monochromatic light pulses, for example a diode laser.
  • the pump beam may be delivered by any source with wide or narrow band (parametric oscillator, CO 2 laser, HF laser, etc.).
  • the Raman effect the use of stimulated light diffusion by Brillouin effect may be contemplated, as well as other non linear physical actions involving interaction of at least two types of photons.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Lasers (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
US06/264,095 1980-05-16 1981-05-15 Process and device for delivering a monochromatic light beam by stimulated scattering Expired - Fee Related US4348599A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8011064A FR2482735A1 (fr) 1980-05-16 1980-05-16 Procede et dispositif d'obtention de faisceaux lumineux monochromatiques par diffusion stimulee
FR8011064 1981-05-16

Publications (1)

Publication Number Publication Date
US4348599A true US4348599A (en) 1982-09-07

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US06/264,095 Expired - Fee Related US4348599A (en) 1980-05-16 1981-05-15 Process and device for delivering a monochromatic light beam by stimulated scattering

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US (1) US4348599A (cg-RX-API-DMAC7.html)
JP (1) JPS5710287A (cg-RX-API-DMAC7.html)
DE (1) DE3118276A1 (cg-RX-API-DMAC7.html)
FR (1) FR2482735A1 (cg-RX-API-DMAC7.html)
GB (1) GB2076215B (cg-RX-API-DMAC7.html)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4618783A (en) * 1983-10-06 1986-10-21 Centre National De La Rechereche Scientifique Production of short light pulses by time compression
DE3735200A1 (de) * 1987-10-17 1989-05-03 Siemens Ag Verfahren zur erzeugung von laserstrahlung hoher wiederholungsfrequenz im infrarotbereich, insbesondere zur uran-isotopentrennung
US4829528A (en) * 1988-09-22 1989-05-09 Allied-Signal Inc. Interlocked ring intracavity raman laser method of generating raman shifted laser output
US4914658A (en) * 1987-10-30 1990-04-03 Max-Plank-Gesellschaft Zur Foerderung Der Wissenschaften E.V. Mode-locked laser
US5583877A (en) * 1995-05-09 1996-12-10 Ophir Corporation Method and apparatus for generating high power laser pulses in the two to six micron wavelength range
US5652763A (en) * 1994-05-02 1997-07-29 University Of Central Florida Mode locked laser diode in a high power solid state regenerative amplifier and mount mechanism
US6021140A (en) * 1998-04-17 2000-02-01 Spectra-Physics Lasers, Inc. Polarization based mode-locking of a laser
US6078417A (en) * 1997-05-29 2000-06-20 Lucent Technologies Inc. Spectral compaction via cross-modulation wavelength conversion
US7106776B1 (en) * 2003-08-01 2006-09-12 Sorokin Peter P Discharge-pumped “dressed-atom” coherent light amplifier and generators

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62196466A (ja) * 1986-02-25 1987-08-29 Honda Motor Co Ltd 逆転歯車の鳴音発生防止装置
FR2691588B1 (fr) * 1989-05-30 1994-12-30 Thomson Csf Source laser de puissance.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3515897A (en) * 1967-04-21 1970-06-02 Ibm Stimulated raman parametric amplifier

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3571607A (en) * 1968-11-05 1971-03-23 Bell Telephone Labor Inc Highly efficient raman emission device
JPS4945636A (cg-RX-API-DMAC7.html) * 1972-09-01 1974-05-01
US3892979A (en) * 1973-03-21 1975-07-01 Ibm Tunable infra red/ultraviolet laser
US4151486A (en) * 1977-03-09 1979-04-24 Avco Everett Research Laboratory, Inc. Tunable alkali metallic vapor laser
US4278902A (en) * 1978-12-29 1981-07-14 International Business Machines Corporation Tunable 16-micron coherent source including parahydrogen Raman transition and method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3515897A (en) * 1967-04-21 1970-06-02 Ibm Stimulated raman parametric amplifier

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4618783A (en) * 1983-10-06 1986-10-21 Centre National De La Rechereche Scientifique Production of short light pulses by time compression
DE3735200A1 (de) * 1987-10-17 1989-05-03 Siemens Ag Verfahren zur erzeugung von laserstrahlung hoher wiederholungsfrequenz im infrarotbereich, insbesondere zur uran-isotopentrennung
US4914658A (en) * 1987-10-30 1990-04-03 Max-Plank-Gesellschaft Zur Foerderung Der Wissenschaften E.V. Mode-locked laser
US4829528A (en) * 1988-09-22 1989-05-09 Allied-Signal Inc. Interlocked ring intracavity raman laser method of generating raman shifted laser output
US5652763A (en) * 1994-05-02 1997-07-29 University Of Central Florida Mode locked laser diode in a high power solid state regenerative amplifier and mount mechanism
US5583877A (en) * 1995-05-09 1996-12-10 Ophir Corporation Method and apparatus for generating high power laser pulses in the two to six micron wavelength range
US6078417A (en) * 1997-05-29 2000-06-20 Lucent Technologies Inc. Spectral compaction via cross-modulation wavelength conversion
US6021140A (en) * 1998-04-17 2000-02-01 Spectra-Physics Lasers, Inc. Polarization based mode-locking of a laser
US7106776B1 (en) * 2003-08-01 2006-09-12 Sorokin Peter P Discharge-pumped “dressed-atom” coherent light amplifier and generators

Also Published As

Publication number Publication date
FR2482735B1 (cg-RX-API-DMAC7.html) 1984-02-10
FR2482735A1 (fr) 1981-11-20
JPS5710287A (en) 1982-01-19
GB2076215A (en) 1981-11-25
DE3118276A1 (de) 1982-06-03
GB2076215B (en) 1983-09-01

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